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Diffstat (limited to 'ANDROID_3.4.5/arch/m68k/fpsp040/stanh.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/m68k/fpsp040/stanh.S | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/ANDROID_3.4.5/arch/m68k/fpsp040/stanh.S b/ANDROID_3.4.5/arch/m68k/fpsp040/stanh.S deleted file mode 100644 index 7e12e59e..00000000 --- a/ANDROID_3.4.5/arch/m68k/fpsp040/stanh.S +++ /dev/null @@ -1,184 +0,0 @@ -| -| stanh.sa 3.1 12/10/90 -| -| The entry point sTanh computes the hyperbolic tangent of -| an input argument; sTanhd does the same except for denormalized -| input. -| -| Input: Double-extended number X in location pointed to -| by address register a0. -| -| Output: The value tanh(X) returned in floating-point register Fp0. -| -| Accuracy and Monotonicity: The returned result is within 3 ulps in -| 64 significant bit, i.e. within 0.5001 ulp to 53 bits if the -| result is subsequently rounded to double precision. The -| result is provably monotonic in double precision. -| -| Speed: The program stanh takes approximately 270 cycles. -| -| Algorithm: -| -| TANH -| 1. If |X| >= (5/2) log2 or |X| <= 2**(-40), go to 3. -| -| 2. (2**(-40) < |X| < (5/2) log2) Calculate tanh(X) by -| sgn := sign(X), y := 2|X|, z := expm1(Y), and -| tanh(X) = sgn*( z/(2+z) ). -| Exit. -| -| 3. (|X| <= 2**(-40) or |X| >= (5/2) log2). If |X| < 1, -| go to 7. -| -| 4. (|X| >= (5/2) log2) If |X| >= 50 log2, go to 6. -| -| 5. ((5/2) log2 <= |X| < 50 log2) Calculate tanh(X) by -| sgn := sign(X), y := 2|X|, z := exp(Y), -| tanh(X) = sgn - [ sgn*2/(1+z) ]. -| Exit. -| -| 6. (|X| >= 50 log2) Tanh(X) = +-1 (round to nearest). Thus, we -| calculate Tanh(X) by -| sgn := sign(X), Tiny := 2**(-126), -| tanh(X) := sgn - sgn*Tiny. -| Exit. -| -| 7. (|X| < 2**(-40)). Tanh(X) = X. Exit. -| - -| Copyright (C) Motorola, Inc. 1990 -| All Rights Reserved -| -| For details on the license for this file, please see the -| file, README, in this same directory. - -|STANH idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - -#include "fpsp.h" - - .set X,FP_SCR5 - .set XDCARE,X+2 - .set XFRAC,X+4 - - .set SGN,L_SCR3 - - .set V,FP_SCR6 - -BOUNDS1: .long 0x3FD78000,0x3FFFDDCE | ... 2^(-40), (5/2)LOG2 - - |xref t_frcinx - |xref t_extdnrm - |xref setox - |xref setoxm1 - - .global stanhd -stanhd: -|--TANH(X) = X FOR DENORMALIZED X - - bra t_extdnrm - - .global stanh -stanh: - fmovex (%a0),%fp0 | ...LOAD INPUT - - fmovex %fp0,X(%a6) - movel (%a0),%d0 - movew 4(%a0),%d0 - movel %d0,X(%a6) - andl #0x7FFFFFFF,%d0 - cmp2l BOUNDS1(%pc),%d0 | ...2**(-40) < |X| < (5/2)LOG2 ? - bcss TANHBORS - -|--THIS IS THE USUAL CASE -|--Y = 2|X|, Z = EXPM1(Y), TANH(X) = SIGN(X) * Z / (Z+2). - - movel X(%a6),%d0 - movel %d0,SGN(%a6) - andl #0x7FFF0000,%d0 - addl #0x00010000,%d0 | ...EXPONENT OF 2|X| - movel %d0,X(%a6) - andl #0x80000000,SGN(%a6) - fmovex X(%a6),%fp0 | ...FP0 IS Y = 2|X| - - movel %d1,-(%a7) - clrl %d1 - fmovemx %fp0-%fp0,(%a0) - bsr setoxm1 | ...FP0 IS Z = EXPM1(Y) - movel (%a7)+,%d1 - - fmovex %fp0,%fp1 - fadds #0x40000000,%fp1 | ...Z+2 - movel SGN(%a6),%d0 - fmovex %fp1,V(%a6) - eorl %d0,V(%a6) - - fmovel %d1,%FPCR |restore users exceptions - fdivx V(%a6),%fp0 - bra t_frcinx - -TANHBORS: - cmpl #0x3FFF8000,%d0 - blt TANHSM - - cmpl #0x40048AA1,%d0 - bgt TANHHUGE - -|-- (5/2) LOG2 < |X| < 50 LOG2, -|--TANH(X) = 1 - (2/[EXP(2X)+1]). LET Y = 2|X|, SGN = SIGN(X), -|--TANH(X) = SGN - SGN*2/[EXP(Y)+1]. - - movel X(%a6),%d0 - movel %d0,SGN(%a6) - andl #0x7FFF0000,%d0 - addl #0x00010000,%d0 | ...EXPO OF 2|X| - movel %d0,X(%a6) | ...Y = 2|X| - andl #0x80000000,SGN(%a6) - movel SGN(%a6),%d0 - fmovex X(%a6),%fp0 | ...Y = 2|X| - - movel %d1,-(%a7) - clrl %d1 - fmovemx %fp0-%fp0,(%a0) - bsr setox | ...FP0 IS EXP(Y) - movel (%a7)+,%d1 - movel SGN(%a6),%d0 - fadds #0x3F800000,%fp0 | ...EXP(Y)+1 - - eorl #0xC0000000,%d0 | ...-SIGN(X)*2 - fmoves %d0,%fp1 | ...-SIGN(X)*2 IN SGL FMT - fdivx %fp0,%fp1 | ...-SIGN(X)2 / [EXP(Y)+1 ] - - movel SGN(%a6),%d0 - orl #0x3F800000,%d0 | ...SGN - fmoves %d0,%fp0 | ...SGN IN SGL FMT - - fmovel %d1,%FPCR |restore users exceptions - faddx %fp1,%fp0 - - bra t_frcinx - -TANHSM: - movew #0x0000,XDCARE(%a6) - - fmovel %d1,%FPCR |restore users exceptions - fmovex X(%a6),%fp0 |last inst - possible exception set - - bra t_frcinx - -TANHHUGE: -|---RETURN SGN(X) - SGN(X)EPS - movel X(%a6),%d0 - andl #0x80000000,%d0 - orl #0x3F800000,%d0 - fmoves %d0,%fp0 - andl #0x80000000,%d0 - eorl #0x80800000,%d0 | ...-SIGN(X)*EPS - - fmovel %d1,%FPCR |restore users exceptions - fadds %d0,%fp0 - - bra t_frcinx - - |end |